Short answer
"5th generation" is a seller term. Omega does not number its 1957 Speedmaster re-editions. The 1957 Speedmaster is a real reference line: CK2915 from 1957, plus re-editions in 1997, 2007, and 2017. A replica listing that says "5th generation" is describing a factory batch, not an Omega model. No published standard defines what gen 5 contains.
The genuine 1957 line
Omega released the Speedmaster CK2915 in 1957. The case was steel, sized near 39 mm, with a steel tachymeter bezel that carried an engraved scale. Omega returned to that design three times.
- 1997: ref. 3594.50.00. Steel case at 42 mm, black dial, broad arrow hour hand, hand-wound caliber 1861.
- 2007: 50th anniversary releases. Omega published the piece counts.
- 2017: the 1957 Trilogy. Case size 38.6 mm, caliber 1861, sold as a three-watch set and as single references.
Where the generation labels come from
Replica sellers group output by batch. A batch with a revised case profile or a new dial print gets a higher number. The markers used are case diameter, lug shape, bezel font, hand length, crystal material, and dial text weight. The numbering resets from seller to seller. One seller's "5th gen" is another seller's "V3". Photos and measurements carry more weight than the number.
Spec points to verify
- Case size. Ref. 3594.50.00 measures 42 mm. The 2017 Trilogy measures 38.6 mm.
- Bezel. The 1957 design uses a steel tachymeter bezel with an engraved scale. Later Speedmasters use a black insert.
- Hands. Broad arrow hour hand. The 1997 re-edition follows this.
- Subdials. Three registers at 3, 6, and 9 o'clock.
- Winding. The originals are hand-wound. No rotor.
Market facts
Sellers use the gen number as a price tier. Higher numbers carry higher asking prices. Independent tear-downs of these watches are rare, so the movement inside is an unknown until a watchmaker opens the case. Omega does not service counterfeit watches, and no factory parts catalog exists for them. Resale value sits near zero.
US legal position
Counterfeit watches fall under 18 U.S.C. 2320, which sets criminal penalties for trafficking in counterfeit goods. Civil claims fall under the Lanham Act, 15 U.S.C. 1114. US Customs and Border Protection can seize shipments at import, and that authority applies to single-item orders. A watch that carries the Omega name and a Speedmaster dial is a counterfeit, not a homage.
What the number cannot tell you
A gen number does not confirm case material, movement origin, water resistance, or lume. Water resistance claims on replica listings are not tested to ISO 22810. Treat any gen label as advertising copy and ask for caliper measurements, a caseback photo, and a movement photo before paying.